I think you’ll find this 1973 essay by Francis Roads, on establishing and promoting clubs in the UK, useful.
(The quote display is from a different article excerpted in the same post.)
I’ll even summarise it further.
- advertise where STEM people are
- emphasise that equipment can be made cheaply
- be prepared to spend a lot of time teaching and playing with beginners
- establish a regular location
- affiliate to the national association
- invite a strong player to give a lecture or simul
- contact local papers and radio stations about Go events
- advertise in libraries
- donate Go books to libraries or try to persuade them to buy some
- offer Go talks to public speaking groups